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utility to mark up significant differences between LaTeX files

latexdiff compares two LaTeX files and marks up significant differences
between them (i.e. a diff for LaTeX files). It generates a new LaTeX file
containing the annotated differences.

Various options are available for visual markup using standard LaTeX packages
such as 'color.sty'. Changes not directly affecting visible text, for example
in formatting commands, are still marked in the LaTeX source.

A rudimentary revision facilility is provided by another Perl script,
'latexrevise', which accepts or rejects all changes. Manual editing of the
difference file can be used to override this default behaviour and accept or
reject selected changes only.